The Klokken Gabbro--Syenite Complex, South Greenland: Cryptic Variation and Origin of Inversely Graded Layering

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Abstract
The Klokken stock has an outer sheath of vertically banded alkali gabbro which passes through syenogabbros into unlaminated syenites surrounding a central layered syenite core. The layered series comprises sheets of granular syenite interleaved with drusy laminated syenite which shows repeated inversely graded mineral layering in which normal leucosyenite becomes progressively more hedenbergite-rich upwards. Tops to layers are nearly feldspar-free, fayalite—magnetite horizons. Model cumulate textures are exhibited, and cross-bedding and normally graded channel structures are encountered. Granular layers often rest on ultramafic layers and load structures occur at the junctions. The series is cut by a sheet of biotite-syenodiorite and finally by quartzsyenite aplites.

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